Improvement in rock-crushers



E. COLEMAN. Rock-Crusher.

No. 222,670. Patented Dec. 16,1879.

UNITED STATES PATENT OFFIGE- EZRA COLEMAN, OF SAN FnAuoIsoo, CALIFORNIA.

IMPROVEMENT IN ROCK-C RUSH ERS.

Specification forming part of Letters Patent No. 222,670, dated December16, 1879; application filed August 11, 1879.

To all whom it may concern Be it known that I, EZRA COLEMAN, of the cityand county of San Francisco; in the State of California, have inventedan Improved Rock-Crusher; and I do hereby declare that the following isa full, clear, and exact description thereof, reference being had to theaccompanying drawings.

My invention relates to an improved rock- 'crusher in which all theelements of strength, simplicity, economy of construction, andcoinvertical section, Fig. 3 a plan view, of my improved rock-crusher;and Fig. 4 represents a detached view of a driving-pulley, showing themanner in which it is secured to the crankshaft.

Let A A represent the two upright sides of the crusher, between whichthe crushing-jaws I are placed and operated. I

The stationary jaw B forms the forward end of the machine, being firmlysecured between the sides A A, as hereinafter described. The

I rear ends of the sides are kept apart by short tubes (3 G, which areplaced between them, and a bolt passes through each tube and throughboth sides, so that a nut on the end of the bolt will draw thesidestogether against the ends of the tubes, thus leaving an open rearend except where the tubes pass across.

The crank-shaft D, which drives the moving jaw, is mounted in bearingsin the sides A A, at the top of the machine, near its rear end.

The boxes in which thebearings of the shaft are supported are made intwo parts or halves, e f, which are secured in slots G in the sides A A.These slots are made large enough to allow the enlargement formed by thecrank on the shaft I) to pass through them after the box has beenremoved.

In casting the sides A A, I cast a rib or flange, 1, around the outsideof each slot, which serves not only to strengthen the sides, but also toprovide a wide seat and bearin g for the box. They also serve to furnisha convenient means of fastening the boxes in the slots. In the presentinstance the two parts of the box are secured in the upper part of theslot by a wedge-shaped pin or bar, h, which passes through holes in theflanges g and through a keyway 0n the under side of the lower part ofthe box. This enables me to remove the crankshaft readily, as I simplyhave to knock out the keys or bars h, which allows the lower parts ofthe box'to drop down. The crankshaft can then be drawn through the slotsafter the wheels on its ends have been re moved. This arrangement alsoenables me to take up the wearon the boxes by driving the key or bar ina little tighter, so as to force the parts of the boxes closertogether;

The flywheels I and drive-pulleys J, I secure to the ends of thecrank-shaft by friction-tight devices, so that in case any unusualstrain should come upon the jaws the wheels will slip. To do this Isimply make a keyway, 7c, in the hub of the wheel, and afterthe wheelhas been adjusted I drive in a key, I, so that its pressure against theface of the shaft will hold the wheel in place against an ordinarystrain.

I am aware that the fly-wheel of a rockcrusher has been fastened to thedrive-shaft by a friction device that will give way when.

In casting the sides A A, I cast a barrel, 0,

horizontally on the outside near the top, and

another near the bottom, and through each,

barrel I run a long metal bolt, 1), so that the head of the bolt will beagainst thefront end of the barrel. The threaded end of the bolt 2 mamawill then project from the rear end of the barrel, on which is a nutscrewed up tightly to hold the bolt firmly in place.

The projecting ends of each two opposite bolts pass through holes in theopposite ends of a horizontal cross-head, Q, which extends across therear end of the crusher-frame, and as there are two pairs of bolts, onenear the bottom and another higher up, there will be two cross-heads, asrepresented. Nuts 1" are then turned on each threaded end, so as to holdthe cross-heads in place. These crossheads are connected with the movingjaw and fit in slots in the rear ends of the sides A, and serve toreceive the strain as follows: A strong plate, S, has one end hinged tolugs on the rear side of the-moving jaw near its lower end, while itsopposite end is hinged to lugs on the lower stationary cross-head, Q.Another similar plate, S, is hinged to the rear side of the moving jawnear its upper end, while its opposite end is hinged to the uppercross-head, Q. upper plate, S, through which the pitman N, whichconnects the crank of the crank-shaft with the lower plate, passes.These plates, arranged in this way, serve as toggles, because their rearends work from a fixed or stationary center, while their forward endsmove up and down when the crank-shaft is rotated, and as the lower endof the pitman N is attached to the moving jaw just above the point wherethe lower plate is hinged to it, the up-and-down motion of the pitmancauses the moving jaw to rise and lower, while the relation of platesand jaw forms a complete toggle. The motion which this arrai'igementimparts to the moving jaw is a compound motion. The direct motion is upand down, but the concentric action of the plate gives a back-and-forthmotion to and from the stationaryjaw. The

up-and-down motion produces a rubbing action on the rock to be crushed,while the backand-forth motion gives the crushing effect, so

that lesspower is required to crush the rock than when a directback-an'd-forth motion is used.

The lower end of the stationary jaw could be bent at a slight angle andextended downward, so that a long rubbing contact would be obtained atthe lower end of the jaws for pulverizing the rock to a very finecondition.

It will be noticed that the strain on the moving jaw is thrown back uponthe cross-heads An opening, 2', is made in the Q Q, by the hingedplates, and as these heads are secured to the longitudinal bolts 1), thegreatest possible strength is obtained.

The moving jaw is set to or from the stationary jaw by turning the nutsr so as to move the cross-heads in or out in the slots at the rear endsof the sides A A, as required.

In order to secure the stationary jaw between the front ends of thesides A A, I form a ledge or projection, U, on the inside edge of eachside A. The jaw is cast with a rib or flange, y, on it near each end, soas to form an angular channel at each end of the jaw, that will fit theprojections 42 when it is placed inside the projections and fitted tothem, as shown at Fig. 3.

The upper end of the moving jaw is out 01f at an angle, as shown, and aplate, P, is arranged to slide down at an angle in grooves in the sidesA A in front of it, so as to form the hopper-opening for directing theore between the jaws, and to prevent the particles of ore from gettingin between the edge of the moving jaw and the sides of the crusher. 1

thus provide a simple, strong, and compact rock-crusher.

Having thus described my invention, what 1. In a machine for crushinghard substances, the combination of the cross-heads Q Q, and adj usting-rods 19, supported in the sides A, with the movable jaw M, having itstogglelevers S S connected to the cross-heads Q Q, substantially as andfor the purpose set forth.

2. In a crushing-machine, the combination of the toggle-levers S S, thelever S having a slot, 2', with the movablejaw M, cross-heads Q Q. sidesA, pitm an N, passing through the slotted lever S, and driving-shaft D,substantially as and for the purpose specified.

3. In a crushinganachine, the combination of the cross-heads Q Q, adjustingrods p, togglelevers SS, the lever S having slot 2', pitman N,extending through the slot of said slotted leverS, with the slottedtubular sides A, jaws M B, and driving-shaft D, substantially as and forthe purpose set forth.

In witness whereof I have hereunto set my hand and seal.

EZRA COLEMAN. [L. s.] Witnesses:

XV. FLOYD DUCKETT, W. F. CLARK.

